Abstract
The result of cyclic voltammetry shows that polyaniline doped with ferrocenesulfonic acid (PAnFc) can effectively catalyze the oxidation of hydrogen peroxide, so PAnFc is used as a sensor to determine the concentration of H2O2. Iron in the ferrocenesulfonic acid exists in two oxidation states: Fe2+ and Fe3+. They can reversibly oxidize and reduce between the Fe2+ and Fe3+ oxidation states, which play an important role in the catalytic oxidation of H2O2. The response current of the sensor depends on the pH, applied potential and temperature at a given concentration of H2O2. At optimum conditions, the sensor has a fast response to H2O2, good operational stability, a good linear response to H2O2 in the range from 4 to 64 microM, and a small temperature dependence of the response current.
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